废轮胎钢纤维混凝土的弯曲韧性试验研究

Toughness tests for waste tires steel fiber reinforced concrete

为探析废轮胎钢纤维混凝土在道路工程中的应用前景,采用ASTM C1018对比测试了不同掺量的废轮胎钢纤维和普通钢纤维对水泥混凝土弯曲韧性的影响。结果表明:废轮胎钢纤维对混凝土韧性具有明显提高作用;随钢纤维掺量的增加,初裂后的荷载-挠度曲线更趋饱满、荷载二次峰值不断提高,混凝土越接近理想弹塑性材料;废轮胎钢纤维混凝土的韧性低于普通钢纤维,若要达到相同韧度,其掺量需较普通钢纤维高25%~45%。

In order to research the application prospect of waste tires steel fiber reinforced concrete in road engineering,the effect of waste tires steel fiber and ordinary steel fiber on toughness of cement concrete were determined using ASTM C1018. The results show that：the waste tires steel fiber has a significant enhancement effect on the toughness of concrete. With the increase of the steel fiber dose,the loading-deflection curve after initial cracking is fuller, the secondary peak of the load is increasing, and the concrete is getting closer to the ideal elastic-plastic material. The toughness of waste steel fiber reinforced concrete is lower than that of ordinary steel fiber. To achieve the same toughness index, the dose of waste tires steel fiber required to be about 25%-45% higher than ordinary steel fiber.